Ambiguity validation with combined ratio test and ellipsoidal integer aperture estimator
Ambiguity validation with combined ratio test and ellipsoidal integer aperture estimator
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DOI：
10.1007/s00190-010-0400-8
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发表时间：
2010-10-01
影响因子：
4.4
通讯作者：
Hu, Congwei
中科院分区：
文献类型：
--
作者：
Ji, Shengyue;Chen, Wu;Hu, Congwei
为了确保可靠的模糊度求解，模糊度验证是必不可少的一步。多年来，这一直是一个挑战，而且远未得到解决。在过去的几年里，人们提出了各种模糊度验证方法，如F比检验、R比检验、差检验、投影仪检验、椭球整数孔径(EIA)估计器和惩罚整数孔径(PIA)估计器。本文通过分析和测试发现，当EIA的孔径区域不允许重叠时，EIA的模糊度解算效率较低，不适用于快速静态定位或实时动态(RTK)应用。在此基础上，提出了孔径区重叠的环评方法，其失败率成为实际失败率的上界。在此基础上，提出了重叠环评和R-Ratio检验相结合的方法可以提高歧义消解的可靠性。最后，利用实际浮标数据和模拟的伽利略数据进行了数值试验。
To ensure reliable ambiguity resolution, ambiguity validation is an indispensable step. It has been a challenge for many years and is far from being resolved. Over the past years, various ambiguity validation methods have been proposed, such as F-ratio test, R-ratio test, difference test, projector test, ellipsoidal integer aperture (EIA) estimator and penalized integer aperture (PIA) estimator. In this paper, through analysis and testing, we find that, when the aperture region of EIA is not allowed to be overlapped, the efficiency of ambiguity resolution with EIA is low and it is not applicable to fast static positioning or real-time kinematic (RTK) applications. Then EIA with overlapped aperture regions is recommended and the resulted fail-rate becomes upper bound of the actual one. After that, it is suggested that combined use of overlapped EIA and R-ratio test can increase the reliability of ambiguity resolution. Finally, numerical tests are carried out based on practical buoy data and simulated Galileo data.